Introduction
The duplex unit allows the printer to print on the front and back of a page without having to manually flip over the paper.
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            Hold the button down with the flat end away from the printer. When you hear a click, the duplex unit can be removed from the printer. 
 
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                            Conclusion
                          
                          Once the duplex unit is installed, your printer will be able to print on the front and back of pages.